Making An 8" Hole In The Brick - Building & Construction - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction


Thread Tools Display Modes
Old 11-24-2006, 08:16 PM   #1
Join Date: Feb 2006
Location: Chicago
Posts: 24
Rewards Points: 10

Making an 8" hole in the brick

I have an old brick home, built in 1926 or thereabouts. It's actually a 2-unit building; we are on the second floor. The outer walls are made of 3 courses of brick; there is no framing as you'd see in newer construction.

I need to open an 8" diameter hole in the brick, so I can put an exhaust fan over the stove and have it exhaust to the outside. My friend rented some sort of brick hole cutter from Home Depot and said it was easy to make a nice big round hole all the way through your brick. My question is this:

Assuming the brick is sound, is this hole too big to be putting in the side of my house? I don't want to weaken the wall. Do I need to shore up the brick at all in the hole? (Ie, maybe there's some sort of liner or something I need to use in there; who knows?)

Because of space constraints, my hole will be 5" from the side of the chimney. I dunno if chimneys add any structural burden to the issue, or if there is some sort of minimal distance to the chimney because of the danger of exhaust gasses rentering the house (but the hole will be a good 6 feet down from the top of the chimney).




Hushpuppy is offline   Reply With Quote
Old 11-25-2006, 08:03 AM   #2
General Contractor
joasis's Avatar
Join Date: May 2006
Posts: 876
Rewards Points: 500

I think you need to back off and be sure you are completely certain you are making the right approach. Exhaust fans can be adapted to a rectangle opening, that would allow a nicer cap outside, plus allow you to chisel out the bricks carefully to size, hand..hammer and brick chisel. I cannot imagine what Home Depot rented you to cut an 8 inch circle in it is a small demo hammer, and you need experience with those or disasterous results will be obtained.


joasis is offline   Reply With Quote
Old 11-25-2006, 08:11 AM   #3
Join Date: Sep 2006
Posts: 1,670
Rewards Points: 1,000

I agree with joasis. The only tool I know of that will cut a really nice round hole is a diamond bit drill. They don't rent these at HD. It is likely you will end up ruining a bunch of bricks. Hand scoring with a chisel is the best way to do this. 8" is a pretty big hole for a bathroom exhaust fan.
If you have never made a mistake, you haven't done much.
majakdragon is offline   Reply With Quote
Old 11-25-2006, 08:43 AM   #4
World famous jerk.
Join Date: Dec 2005
Location: central PA
Posts: 440
Rewards Points: 250

I've core drilled an 8" hole in a brick curtain wall, but not a structural brick wall. I'm not so sure I'd core that big of a hole in a structural brick wall. Leave that up to a mason. They can install a proper lintel that would be required.

Consequently, 8" round is the normal size for a through the wall range exhaust fan.
mdshunk is offline   Reply With Quote
Old 11-25-2006, 09:15 AM   #5
Join Date: Feb 2006
Location: Chicago
Posts: 24
Rewards Points: 10

Thanks for the replies!

Thanks for the replies, guys. Looks like I need a mason... Yes, this is for a stove in the kitchen, not a bathroom, and it's asking for an 8" hole to get the proper airflow that we want.
Hushpuppy is offline   Reply With Quote
Old 11-25-2006, 11:44 AM   #6
concretemasonry's Avatar
Join Date: Oct 2006
Location: Minneapolis/St. Paul, Minnesota - Latitude 45.057 Longitude -93.074
Posts: 4,075
Rewards Points: 2,640

Have a mason do the sawing - He can do it easier, faster and with less mess. - And probably cheaper if you consider all the time, rental and running.

Drilling a hole as small as 8" in a thick masonry wall should not require any reinforcing because the the naturak "arch action" of the masonry. The loads are naturally spread out. Your walls are as thick as they are because of the thickness of the lower walls and the desire for uniform construction from top to bottom. I have seen 20 story buildings built out of 6" thick block walls with no steel or concrete columns or beams. - It is not a serious as drilling a hole in a wood joist that carries a much more concentrated load.
concretemasonry is online now   Reply With Quote
Old 11-28-2006, 07:17 AM   #7
Join Date: Oct 2005
Location: Boston
Posts: 129
Rewards Points: 75

brick hole

If this is a brick veneer cavity wall the important issue is flashing of the backup wall. The larger the initial brick opening, the easier it will be to install flashing. When this flashing is omitted, water penetration will usually depend on the density of the brick and mortar.


mighty anvil is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
water leaking through brick chimney quigleybmd Concrete, Stone & Masonry 45 02-26-2013 04:26 PM
Bad Brick Mortar ??? kourso Building & Construction 21 11-08-2010 12:11 AM
Cheaper masonry alternatives to brick? Jemo Building & Construction 9 05-18-2007 12:31 PM
Brick: to paint or not to paint, that is the ? Turnip Painting 3 04-15-2007 10:06 PM
I hope I don't have to tear down the ceiling brds16 Carpentry 9 04-30-2005 10:16 AM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1